Stuffing-box.



No. 884,318. PATENTED APR. 7, 1908. F. A. DAILEY & B. LONG. STUFFINGBOX.

APPLICATION FILED APR. 29, 1907.

' 2 SHEBTSSHEET l.

[CF f6 f? [4 j? Y f if I WW4 [MW 700% FMA. fizz 2Z6 wwlaw PATENTED APR.7, 1908. F. A. DAILEY & B. LONG.

STUFFING BOX APPLICATION FILED APR.29, 1907.

2 SHEETS-SHEET 2.

NITED STATES PATENT OFFICE.

FRED A. DAILEY, OF ST. PAUL, AND BARNEYLONG, OF MINNEAPOLIS, MINNESOTA.r

sTU'FFme-Box.

No. 884,3 1s.

Specification of Letters Patent.

Patented A rnv, 1908.

Application flled April 29, 1907. Serial No. 370,917.

To all whom it may concern:

Be it known that we, FRED A; DAILEY and BARNEY LONG, citizens of theUnited States, residing, respectively, at St. Paul, in the county ofRamsey and State of Minnesota, and Minnea olis, in the county ofHennepin and State 0 Minnesota, have invented certain new and usefulImprovements in Stufling-Boxes, of which the following is aspecification. I v

Our invention relates to improvements in stufiing boxes, its objectsbeing to rovide a stufiin box which may be packe and "reacke with lasticacking without removlng theglan which has a communicating chamber inwhich a reserve sup 1y of packing may be stored and held unc erpressure, and from which the packing may be forced into the stufling boxproper as needed; and which has means for lndicating the pressure 11%011the packingand the amount of packing W ich has been fed from the chamberto the stufling box.

With these objects in view our invention consists in the construction,combination and arrangement of parts hereinafter described and claimed.

In t e accom anying drawings, in whichis shown the pre erred form of ourinvention, Figure 1 is an end view of a stufling box embodying ourimprovements; Fig. 2 is a vertical section through the same on line:c-ac of Fig. 1; Fig. 3 is a cross section through the 1 storage chamberon line z2 of Fig. 2; Fig.

4 is a vertical section through the storage chamber on line x''x of Fig.l on an-enlarged scale; Figs. 5 and 6 are front and side views,respectively, of the cooperating members comprising one of the throatrings; Figs. 7 and Sare side andfront views, respectively, of thefollower for the back throat ring; Fig. 9 is a vertical section partlybroken away on line y. y of Fig. 2; and Fig. 10 is a ipiers ective viewof the inner end of the stu ng ox casing, the casing being shown partlybroken away.

In the drawin s A re resents so much of the cylinder hea and so much ofthe piston rod, of an ordinary reciprocating engine as is necessary toshow the application of our invention to a stufling box adapted for usewith such-mechanism.

The cylinder head is counterbored in the usual manner to receive thecasing 2 of the stufiing box, and the annular she 3 of the cone member,which telescopes over the open against it.

the stuffing box casing isbeveled at the same angle as the cone so as tosecure a sliding fit Arranged against the rear end of the cone is therear throat ring 5 formed of two cooperating halves as illustrated inFigs. 5 and 6. These ring members are arranged with overlapping ends,and are beveled at the same taper as the rear portion of the cone 4 inorder to secure a sliding fit against the cone. They are held normallypressed against the cone by means of a coil spring 7 interposed betweenthe shoulder 8 of the cylinder head and the follower ring 9 which abutsagainst the throat ring. 1

The rear end of the stuffing box casin is reduced in diameter, andformed with sTits 10, as shown in Fig. 10, in order that it may beslightly sprung in when in forced engagement with t e cone. To preventthe acking from being squeezed rough the s its a similarly slitted sheetlining 11 is arranged within the casing in such manner that itsslits'will not register with the slits in the casing. The stufiin' boxis formed exteriorly with an annular ange 12, and is'detachably securedto the cylinder head by means of an annular land 13 which forms a steamtight joint with the flange 12. The gland may be secured to the cylinderhead by studs'14, and a steam ti ht joint is secured between the glandand t e cylinder head by arranging between them a gasket 15.

The stuffing box is formed at its forward end with an inwardly rojectingshoulder 16 the front ring 18. This ring is in two halves and is slippedinside the stuffing box from the rear end, and held up against theshoulder 16 by means of a ring nut 19. The inner or rear end of thesplit ring 18 is beveled off to form a sliding joint with the opositely' beveled front throat ring 20, whic is constructed in twohalves snnilar to the back throat ring already described. The s aceabout the iston rod betweenthe' throat rings is intended to be filledwith plastic packing, not shown. I i

Near its forward or outer end, the stufiing box casing is formed orprovided with a tuto form an abutment or the shoulder 17 of I pare I ofany Suitable plastic packing. This chamber communicates with thestufiing box, and its side wall orwalls 21 are preferablyintegral withthe stufiing box, as shown. Working within the chamber is a screwoperated ram'or plunger, which in the preferred form shown in thedrawings is in the shape of a piston 22 having a rod or stem 23 whichasses slidingly through'the head 24 of a eed-nut 25, and has at itsouter end a head or stop-nut 26 to limit its inward movement into thechamber. The feed-nut 25 is preferably arranged on the exterior of thechamber, as shown in the drawings, and has screwthreaded engagement, asat 27, with the chamber-wall 21. The feed-nut may be provided interiorlywith a tube or bushing 28 immediately surrounding the piston-rod andcentrally secured in the nut-head 24 by pins 29. The iston is heldnormally pressed in towards t e stufling box by means-of a coil spring30 interposed between the piston and t e feed-nut. The, spring ispreferably of such length and strength as to hold the .pis-

ton normally thrust into the chamber far enough to bring the stop-nut 26against the to of the feed-nut 25, as shown in Fig. 2. lhe feed-nut 25,when itis arranged exteriorly of the chamber-wall 21 as shown in thedrawings, may be held from working back from any in-screwed position bymeans of a spring 31 secured to the stufiing box casing and adapted tospring into recesses 32 in an annular lug 33 upon the feed-nut 25.

To apply the packing the feed-nut 25 is first unscrewed and withdrawnfrom the chamber, carrying with it its connected plunger parts. Asufficient amount of preplastic acking is then inserted into thechamber, and the piston and feed-nut are replaced. The feed nut is thenscrewed down until enough of the packing has been forced into thestuffing box pro or to fill it and leave the chamber partially ed. Theresistance of the packing will force the piston against the springpressure of its spring 30, and cause the outer end of the piston rod tobe thrust out beyond the head of the feed-nut, as illustrated in Fig.4.- In this position the piston will exert a constant elast1c pressureagainst the packing, and as the packing in the stuffin'g box wears down,the packing .in the chamber will be forced in to take its lace,

and the plunger will gradually move own, under the pressure of itsspring 30, until the 'stop-nut 26 at the end of the piston rod engagesthe top of the feed-nut, as shown in Fig. 2. By then screwing the feednut further down the pressure of the iston u on the packing will berenewed, an the on of the piston rod will again be thrust out throu hthetop of the feed-nut into the position s own inFig. 4. The stop-nut26, or rather the outer end of the piston rod, will thus be a telltaleto indicate Whether or not pressure is being exerted upon the packing,

and the position of the iston rod together with the extent to whic thefeed-nut has been screwed down will indicate the amount of packing whichhas passed into the stora e chamber. In this way a constant tab can ekept both upon the supply of packing and the pressure to which it issubjected.

By the mechanism described the acking in the chamber and stuffing boxcan e kept constantly under elastic pressure, the de me of pressure canbe varied, andthe stu g box and chamber can be filled and refilledwithout removing the gland. If desired, the tube or bushing 28 may bemade of considerable length, so as to form a solid abutment for thepiston when the spring has been partially compressed, and cause thepiston to exert thereafter a positive, unyielding, pressure against theacking.

While, for the purpose of illustration, we have shown our improvementsapplied to the piston rod. stuffing box of an ordinary reciprocatingengine, it will be understood that they may be equally well applied tostufiing boxes of any suitable construction, and for use with anydesired mechanism; and the details of the device may be modified invarious Ways without de arting from the principle of the invention, t escope of which is defined in the claims.

We claim as our invention 1. The combination, witha stufiin box, of achamber communicating with t e interior of the box and extendingoutwardly therefrom, said chamber being adapted to hold a reserve su plyof plastic packing, and a screw operate ram working within the chamber,and adapted, when screwed in, to force a supply of the stored packinfrom the storage chamber into the stuffing ox.

2. The combination, with a stufiing box, of a packing chambercommunicating therewith, a feed-nut having screw engagement with thechamber wall, a plunger working within the chamber and having slidingsupport in the feed-nut, and a spring interposed etween the plunger andthe feed-nut.

3. The combination, with a stuffing box, of a packing'chambercommunicating therewith, a feed-nut having screw engagement with thechamber wall, a lunger working within the chamber and having a rodextend ing slidably through the top of the feed-nut, a stop-nut upon theend of the rod, and a spring interposed between the plunger and t efeed-nut.

In testimony whereof we afiix our signa tures in presence of twowitnesses.

FRED A. DAILEY. BARNEY LONG.

Witnesses:

ARTHUR P. LOTHROP, HENRY B. BLAKE.

